/**
 * Copyright Aquera Inc 2023
 *
 * This source code is licensed under the BSD-3-Clause license found in the
 * LICENSE file in the root directory of this source tree.
 */

import {LitElement, html, CSSResultArray, TemplateResult} from 'lit';
import { customElement, property } from 'lit/decorators.js';
import {styles} from './nile-radio.css';
import { classMap } from 'lit/directives/class-map.js';
import { state } from 'lit/decorators.js';
import { watch } from '../internal/watch';
import NileElement from '../internal/nile-element';
import type { CSSResultGroup } from 'lit';
/**
 * Nile icon component.
 *
 * @tag nile-radio
 *
 *
* @dependency nile-icon
 *
 * @slot - The radio's label.
 *
 * @event blur - Emitted when the control loses focus.
 * @event focus - Emitted when the control gains focus.
 *
 * @csspart base - The component's base wrapper.
 * @csspart control - The circular container that wraps the radio's checked state.
 * @csspart control--checked - The radio control when the radio is checked.
 * @csspart checked-icon - The checked icon, an `<nile-icon>` element.
 * @csspart label - The container that wraps the radio's label.
 */
@customElement('nile-radio')
export class NileRadio extends NileElement {
  static styles: CSSResultGroup = styles;

  @property({type:Boolean}) checked = false;
  @state() protected hasFocus = false;

  /** The radio's value. When selected, the radio group will receive this value. */
  @property() value: string = '';

  /** The radio's size. */
  @property({ reflect: true }) size: 'small' | 'medium' | 'large' = 'medium';

  /** Disables the radio. */
  @property({ type: Boolean, reflect: true }) disabled = false;

  /** The radio's labelborder. */
  @property({ type: Boolean, reflect: true }) islabelborder = false;

  
  @property({ type: Boolean, reflect: true }) allowUncheck = false;

  connectedCallback() {
    super.connectedCallback();
    this.handleBlur = this.handleBlur.bind(this);
    this.handleClick = this.handleClick.bind(this);
    this.handleFocus = this.handleFocus.bind(this);

    this.setInitialAttributes();
    this.addEventListeners();
    this.emit('nile-init');
  }

  disconnectedCallback() {
    this.removeEventListeners();
    this.emit('nile-destroy');
  }

  private addEventListeners() {
    this.addEventListener('blur', this.handleBlur);
    this.addEventListener('click', this.handleClick);
    this.addEventListener('focus', this.handleFocus);
  }

  private removeEventListeners() {
    this.removeEventListener('blur', this.handleBlur);
    this.removeEventListener('click', this.handleClick);
    this.removeEventListener('focus', this.handleFocus);
  }

  private handleBlur() {
    this.hasFocus = false;
    this.emit('nile-blur')
  }

  private handleClick() {

    if(this.allowUncheck && !this.disabled) {
      this.checked = !this.checked;
    } else if (!this.disabled) {
      this.checked = true;
    }
  }

  private handleFocus() {
    this.hasFocus = true;
    this.emit('nile-focus')
  }

  private setInitialAttributes() {
    this.setAttribute('role', 'radio');
    this.setAttribute('tabindex', '-1');
    this.setAttribute('aria-disabled', this.disabled ? 'true' : 'false');
  }

  @watch('checked')
  handleCheckedChange() {
    this.setAttribute('aria-checked', this.checked ? 'true' : 'false');
    if (this.disabled) {
      this.setAttribute('tabindex', '-1');
    } else {
      this.setAttribute('tabindex', this.checked ? '0' : '-1');
    }
  
  }

  @watch('disabled', { waitUntilFirstUpdate: true })
handleDisabledChange() {
  this.setAttribute('aria-disabled', this.disabled ? 'true' : 'false');
  if (this.disabled) {
    this.setAttribute('tabindex', '-1');
    
    if (this.matches(':focus')) {
      (this as HTMLElement).blur();
    }
  } else {
    this.setAttribute('tabindex', this.checked ? '0' : '-1');
  }
}

  render() {
    return html`
      <span
        part="base"
        class=${classMap({
          radio: true,
          'radio--checked': this.checked,
          'radio--disabled': this.disabled,
          'radio--focused': this.hasFocus,
          'radio--medium': this.size === 'medium',
          'radio__label_border':this.islabelborder
        })}
      >
        <span part="${`control${this.checked ? ' control--checked' : ''}`}" class="radio__control">
          ${this.checked
            ? html` <span class="radio__checked-icon"></span> `
            : ''}
        </span>

        <slot part="label" class="radio__label"></slot>
      </span>
    `;
  }
}

export default NileRadio;

declare global {
  interface HTMLElementTagNameMap {
    'nile-radio': NileRadio;
  }
}